. The Street railway journal . FIG. 15. Street FIGS. 17 AND 15-21.—DETAILS OF PORTER-ALLEN ENGINE. and that there is a corresponding cavity in each coverplate communicating with the port through the center ofthe valve. As a valve is moved to one side, steam isadmitted both to the port and to the cavity in the coverplate at both ends of the valve so that at the moment ofopening there are practically four ports which operate tomake the admission, cut-off and release very prompt andeffective. The two steam valves are operated by separatevalve stems connected through links to l
. The Street railway journal . FIG. 15. Street FIGS. 17 AND 15-21.—DETAILS OF PORTER-ALLEN ENGINE. and that there is a corresponding cavity in each coverplate communicating with the port through the center ofthe valve. As a valve is moved to one side, steam isadmitted both to the port and to the cavity in the coverplate at both ends of the valve so that at the moment ofopening there are practically four ports which operate tomake the admission, cut-off and release very prompt andeffective. The two steam valves are operated by separatevalve stems connected through links to levers at differentangles on a rockshaft, as shown in plan in Fig. 17, and inelevation in Fig. 18, thus securing for these separatevalves, the prompt action in opening and slight motionwhen closed, due to the wrist motion of the Corliss valvegear. The two exhaust valves for each cylinder are con-nected together and operated independently. In the tan-dem compound engine shown, the admission valves of thehigh pressure cylinders only are
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
